/Engine/Source/Editor/UMGEditor/Public/UMGEditorModule.h
Remove customization for widget
void RemoveWidgetCustomizationExtender ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IBlueprintWidgetCustomizationExtender](API\Editor\UMGEditor\Customizations\IBlueprintWidgetCustomizationExt-) > & WidgetCustomizationExtender )